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Expansion of (x^2 - y^2)

87∧ 2-13∧ 2

Question

87^2-13^2

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Solution

We know the identity a^2-b^2=(a+b)(a-b)
so
87^3-13^2=(87+13)(87-13)
=100×74
=7400
hope you understand this

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Q. Find the value of

87^{2} - 13^{2}

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Q. Question 87 (ix)

Write the greatest common factor in the following terms.

13 x^{2} y, 169 x y

Say true or false:

87, 54, 0, - 13, - 4.7, \sqrt{5}, 217, \sqrt{15}, - 87, 3 \sqrt{2}, 4.807, 0.002, \sqrt{16}

2 + \sqrt{3}

are rational numbers.

87 \frac{13}{19}

is in its lowest form?

- 7 (2 + x) = 87

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