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had shreya sccored 10 marks more in her english test out of 30 marks ,5 times if these marks would have been the square of her actual marks how many marks did she get in the test

Posted by Shashant Ahuja 8 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Naveen Sharma 8 years, 5 months ago

Ans. Let her actual marks = x

If she score 10 more then marks = x + 10

According to ques

5(x+10) = x²

=>5x +50 = x²

=> x² - 5x - 50 = 0

=> x² - 10x + 5x - 50 = 0

=> x(x-10) +5(x-10) = 0

=> (x-10)(x+5) = 0

either (x-10) = 0 or (x+5) = 0

x = 10 or x = -5

x can not be -5.

So x = 10

Actual marks = 10

0Thank You

ANSWER

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CBSE > Class 10 > Mathematics