Question

solve my question please

Answer 1

1) (a+b)^2 = a^2 +2ab + b^2
(50+4)^2 = 2500 +2 × 50 × 4 + 16
= 2516 + 400
= 2916
2) (a-b)^2 = a^2 -2ab + b^2
(70-1)^2 = 4900 -2× 70 ×1 + 1
= 4901 -140
= 4761
3) (a-b)(a+b) = (a^2 - b^2)
(14.7× 15.3) = ((15)^2 - (0.3)^2)
= 225 -0.09
= 224.91
4)(a-b)(a+b) = (a^2 - b^2)
(82)^2 - (18)^2 = (82-18)(82+18)
= 64 × 100
= 6400