Question

efetue
a (x+7)²
b (5x²-1)²
c (x=2) (x-2)

Answer 1

a) (x+7)²
x²+14x+49=0
Δ=14²-4*1*49
Δ=0
x= -14+- sqrt(0)/2*1
x=-14+-0/2
x'=x"=-14/2= -7

b) (25x²)²-10x²+1=0
Δ=0
y'=y"=1,5
x=1,2.

c)x²-2x+2x-4=0
x²-4=0
x²=4
x=2
e
x=-2.