Question

Solve each equation by taking square roots 10p^2 +20=1490

Answer 1

$10p^2 +20=1490$  

$10p^2=1490-20$        $Subtract \ 20 \ from \ both \ sides$

$10p^2=1470$ 

$p^2= \dfrac{1470}{10}$         $Divide \ both \ sides \ by \ 10$

$p^2=147$ 

$p=+ \sqrt{147}$       $Take \ the \ square \ root \ of \ both \ sides$

$p=+7 \sqrt{3}$

Answer 2

10p^2+20=1490
1$\sqrt{10p^{2} =1470} 10p=38.34 p=3.834$0p^2=1470