Question

Me ajudem!
A. 8x²=60−7x²
B. 7x²= −14x

Answer 1

A

8x²+7x²=60

15x²=60

x²=60/15

x=+-\/4

x=+-2

S={2}

B.

7x²=-14x

7x²+14x=0

7x(x+2)=0

x1=0

x2: x+2=0

x=-2

S={-2,0}