Sagot :
A= 2x²-36
B= 5x²+16
2) 2x²-36 + 5x²+16
= 7x² + 52
B= -3x² - 20
A=(2x-6)²= (2x)²-2*2x*6+6²=4x-24x+36=4x+12
B=(5x+4)²=(5x)²+2*5x*4+4²=25x+20x+16=45x+16
B=(5x+4)²=(5x)²+2*5x*4+4²=25x+20x+16=45x+16