Quadratic Equation Solver PRO
v1.2 · 1 MB · code 4
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File information
UpdatedJan 30, 2016
PublishedJan 30, 2016
Packagecom.iamkatrechko.quadcalcpro
Versionv1.2 (4)
Size1 MB
MD5b19ac8345d09c5cf92ee7acac71b6b58
Min SDK9
Malware scanTRUSTED
Signature SHA119:9B:4C:14:63:75:4A:74:7C:79:FB:54:03:F5:C8:FA:00:23:4F:3A
SignerCN=Ivanov Mikhail, L=Moscow, C=RU
Total downloads171
This version171
DeveloperI'm Katrechko
Age ratingEveryone
What's new in v1.2
- Added 2 new themes
- Improved optimization for Android 5.0 Lollipop
- Improved optimization for Android 5.0 Lollipop
Security scan
TRUSTED
- Developer signature verified 2016-01-30
- Scanned for malware 2020-01-16 09:18:46
- Signature SHA1 19:9B:4C:14:63:75:4A:74:7C:79:FB:54:03:F5:C8:FA:00:23:4F:3A
- File MD5 b19ac8345d09c5cf92ee7acac71b6b58
How to install Quadratic Equation Solver PRO v1.2 on Android API 9+
Takes about 2 minutes. You'll need roughly 1 MB of free storage.
- Grab com.iamkatrechko.quadcalcpro_4.apk — hit the Download button above (1 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches b19ac8345d09c5cf…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.iamkatrechko.quadcalcpro_4.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Ivanov Mikhail, L=Moscow, C=RU. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Quadratic Equation Solver PRO — tap Open on the install screen, or find the Quadratic Equation Solver PRO icon in your app drawer.
Common install errors for Quadratic Equation Solver PRO
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android API 9 or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.