Question

What is the value of ab if a2 + b2 = 100 in (a + b)2 = 420? Ps: the 2 there is stand for squared

Answer 1

Answer:

160

Step-by-step explanation:

a^2+b^2=100

(a+b)^2 -2ab =100

420-2ab=100

-2ab=100-420

-2ab=-320

ab=320/2 (the minus (-) is cut as it is on both sides)

ab=160