Question

(2.5+1.5)^2 -(2.5−1.5)^2 Simplify

Answer 1

Answer:

$(2.5+1.5)^{2}$- $(2.5-1.5)^{2}$

$(a+b)^{2} -(a-b)^{2}$

$a^{2} +2ab+b^{2} -(a^{2} -2ab+b^{2} )$

$(2.5)^2+2(2.5)(1.5)+(1.5)^2 - ((2.5)^2-2(2.5)(1.5)+(1.5)^2)$$6.25+7.5+2.25-6.25+7.5-2.25$

$=15$