Question

(x-2)(x+5)+(x+3)(4-x) при x=4,5​

Answer 1

Упростим выражение:

(x-2)(x+5) + (x+3)(4-x) = 4x+2;

При x = 4,5, 4x+2 = 4*4,5+2 = 18+2 = 20