Question

Question-9th and 10 plz as soon as poosible.

Answer 1

9) a²+b²+c²= 35
ab+bc+ca= 23
(a+b+c)²= (a²+b²+c²+2ab+2bc+2ca)
(a+b+c)² = 35+2*23
= 81
a+b+c= √81 = 9
Answer:-. a+b+c = 9
10) 2x-3y= 10
xy= 16
8x³- 27x³ = (2x)³ - (3y)³
= (2x-3y)(4x²+6xy+9y²)
= 10(4x²+9y²+6*16)
= 10 ( 4x²+9y²+96)
= 40x²+ 90y²+960