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Algebraic Identities

ii Using x+ax...

Question

Question 8(ii)
Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$ , find
$5.1 \times 5.2$

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Solution

$5.1 \times 5.2 = (5 + 0.1) \times (5 + 0.2)$
$= (5)^{2} + (0.1 + 0.2) \times 5 + 0.1 \times 0.2$
$[U s i n g i d e n t i t y (x + a) (x + b) = x^{2} + (a + b) x + a b]$
$= 25 + 0.3 \times 5 + 0.02$
$= 25 + 1.5 + 0.02 = 26.52$

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Similar questions

Question 8(iv)
Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$ , find
$9.7 \times 9.8$

(x + a) (x + b) = x^{2} + (a + b) x + a b,

5.1 * 5.2

(x + a) (x + b) = x^{2} + (a + b) x + a b

5.1 \times 5.2

Question 8(iii)
Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$ , find
$103 \times 98$

Q. Question 8(i)
Using

(x + a) (x + b) = x^{2} + (a + b) x + a b

103 \times 104

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Algebraic Identities

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