les questions 1 ,2 et 3 svp

1) f(-3) = 2*-3 + 5 = -1

2) 2x + 5 = 4 <=> 2x = -1 <=> x = -1/2

3) (x+3)² - (x+2)² = x² + 2*3x + 3² - ( x² + 2*2x + 2²) = x² + 6x + 9 - x² - 4x - 4
= 2x + 5
Or 2x+5 = f(x)