Question

Find the value at 32 × 28 and 51×49 using expansion formula.​

Answer 1

Answer:

896, 2499

Step-by-step explanation:

32*28

= (30+2)(30-2)

so,

=(30)^2-(2)^2   -------by x square - y square (x^2-y^2)=(x+y)(x-y)

=900-4

=896

51×49

(50+1)(50-1)

so,

=(50)²-1²

=2500-1

=2499

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