`(79^(2) - 9^(2))/(89^(2) - 9^(2)) = "_________"`A. `(5)/(8)`B. `(13)/(15)`C. `(6)/(9)`D. `(11)/(14)`

`(79^(2) - 9^(2))/(89^(2) - 9^(2)) = "_________"`A. `(5)/(8)`B. `(13)/

1.	`(79^(2) - 9^(2))/(89^(2) - 9^(2)) = "_________"`A. `(5)/(8)`B. `(13)/(15)`C. `(6)/(9)`D. `(11)/(14)`
Answer» Correct Answer - D `((79 + 9) (79-9))/((89 + 9) (89-9))` `= (88 xx 70)/(98 xx 80) = (11)/(14)` Hence , the correct option is (d) .

Which of the following is/are perfect squares ?A. `16a^(2) + 36b^(2) - 48 ab`B. `9x^(2) + 18xy + 9y^(2)`C. Both (a) and (b)D. Neither (a) nor (b)
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If `3x + (1)/(x) = 6` , then find `9x^(2) + (1)/(x^(2))`.A. 24B. 27C. 30D. 33
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`x^(3) + xy^(2) - x^(2) y - y^(3) = "_______"`A. `(x^(2) + y^(2)) (x + y)`B. `(x^(2) + y^(2))( x- y)`C. `(x-y) (x + y)^(2)`D. `(x + y) (x- y)^(2)`
An equation which is true for all real values of its variables is called an identify .
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`x^(4) + y^(4) + 2x^(2)y^(2) = "_______"`A. `(x+ y)^(4)`B. `(x^(2) - y^(2))^(2)`C. `(x^(2) + y^(2)) (x^(2) - y^(2))`D. `(x^(2) + y^(2))^(2)`