Question

a)5p²-20=0
b)x²+3x=0
c)3x²-15x=0

Answer 1

5p² - 20 = 0
5p² = 20
p² = 20/5
p² = 4
p = raiz de 4
p = 2

=======================

x² + 3x = 0
x(x + 3) = 0
x = 0 <<<<<<<<
x + 3 = 0
x = -3 <<<<<<<<

=======================

3x² - 15x = 0
3x(x - 5) = 0
3x = 0
x = 0 <<<<<<<<
x - 5 = 0
x = 5 <<<<<<<<