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TO reprsent word problem in the form of ...

TO reprsent word problem in the form of quadratic equations, suppose the unknown required quantity can be taken as some variable x (say) and express the given condition in the form of x to form an equaiton in x. Then wew express the equation in the descending powers of x. Thus standard quadratic equations is `ax^(2) + bx + c = 0, a != 0`.
Sandeep's father is 30 years older than him. The product of their ages 2 years from now will be 400. To find Sandeep's present age, the equation is

A

`x^(2) + 9x - 13 =0`

B

`x^(2) + 32x + 400 = 0`

C

`x^(2) + 34x - 336 = 0`

D

`x^(2) - 34x + 90 = 0`

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