Question

evaluate using identities 68*72​

Answer 1

Answer:

4896

Step-by-step explanation:

$(x - y)(x + y) = {x}^{2} - {y}^{2} \\ (70 - 2)(70 + 2) = {70}^{2} - {2}^{2} \\ 4900 - 4 \\ = 4896$

Answer 2

Step-by-step explanation:

(x+y)(x-y)=(x)²-(y)²

=(70-2)(70+2)

(70)²-(2)²=4900-4=4896

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