Step-by-step explanation:
→ m = –2, n = 3
So:
= 7(5m + 3n) – 2(4m – 4n) + 15
= 7(5(–2) + 3(3)) – 2(4(–2) – 4(3)) + 15
= 7((–10) + 9) – 2((–8) – 12) + 15
= 7(–10 – 9) – 2((–8 + 12) + 15
= 7(–1) – 2(–20) + 15
= –7 – (–40) + 15
= –7 + 40 + 15
= 33 + 15
= 48 ✓
