Question

5a+6b is equals to 15 and ab is equal to 5 . Find 25asquare+36bsquare

Answer 1

5a + 6b = 15

ab = 5

on squaring on both sides

( 5a + 6b ) ^ 2 = 15 ^2 = ( a + b ) ^2 = a^2 + b^2 + 2 (ab)

= ( 5a ^ 2 + 6b ^2 + 2 ( 5 ) = 225

25a^ 2 + 36b ^ 2 + 10 = 225

25a^2 + 36b^2 = 225 - 10 = 215

hope it helps you

pls mark as brainliest