Question

simplify the expression and find its value when a=2 and b=3

3(a²+ab+b²)-2(a²-ab+b²)-(3a-b²)​

Answer 1

Answer:

3(2²+2×3+3²)-2(2²-2×3+3²)-(3×2-3²)

= 3(4+6+9)-2(4-6+9)-(6-9)

= 12+18+27-8+12-18-6+9

= 78-32

= 46

Answer 2

(A) 120° (B) 60° (C) 90° (D) 45°

Solution:

In a triangle, if square of one side is equal to the sum of the squares of the other two sides, then the angle opposite the first side is a right angle.

In ΔABC

AB = 6√3 cm; AC = 12 cm; BC = 6 cm

AB2 = 108

AB2 + BC2 = (108 + 36) cm2

= 14mr__shivam__cr7

Pythagoras theorem