Ex 16:
A= 3 * (x+2)
= 3 *x + 3*2
=3x + 6
B=7 * (x-6)
=7*x + 7*(-6)
=7x - 42
C= 1 * (x+5)
= x + 5
D= 4 * (5-x)
=4*5 + 4*(-x)
=20 - 4x
Ex17:
A= x(x+2)
= x*x + x*2
=x^2 + 2x
B= x(x-6)
= x*x + x*(-6)
=x^2 -6x
C= 3x(x+5)
=3x*x + 3x*5
=3x^2 + 15x
* --> multiplier
^2 --> élevé au carré