Question

1-calcule
a) (3+x)
b)(x+5)
c)(x+2)
e)(3x+2)
f)(2x+1)
g)(5+3a)
h)(2a+x)

Answer 1

a)
(3 + x)² = 3² + 2.3x + x² = 9 + 6x + x² = x² + 6x + 9

b)(x+5)² = x² + 2.5x + 5² = x² + 10x + 25

c)(x+2)² = x² + 2.2x + 2² = x² + 4x + 4

e)(3x + 2)² = (3x)² + 2.2.2x + 2² = 9x² + 8x + 4

f)(2x + 1)² = (2x)² + 2.1.2x + 1² = 4x² + 4x + 1

g)(5 + 3a)² = 5² + 2.5.3a + (3a)² = 25 + 30a + 9a² = 9a² + 30a + 25

h)(2a + x)² = (2a)² + 2.2a.x + x² = 4a² + 4ax + x²