Q5 of 116 Page 6

Simplify the following using the indentities:

(i)


(ii)


(iii)


(iv)


(v)

(i)



=


= 100


(ii)


(178)2 – (22)2


= (178 + 22) (178 – 22)


= 200 × 156


= 31200


(iii)



=


= 300


(iv)


(1.73) – (0.27)


= (1.73 + 0.27) (1.73 – 0.27)


= 2 (1.46)


= 2.92


(v)



=


= 100


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Using the formula for squaring a binomial, evaluate the following:

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Simplify the following using the formula:

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(iii)


(iv)


(v)


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(vii)


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If =20, find the value of .