In a class trip the number of girls is 1 more than the number of boys. If there are x boys, the product of the number of boys and the number of girls is 90. Write this as a quadratic equation in standard form and find the number of boys x.

Question

Accepted Answer

9. Girls = x + 1, so x(x + 1) = 90 gives x^2 + x - 90 = 0 = (x - 9)(x + 10). Positive root x = 9 boys.

In a class trip the number of girls is 1 more than the number of boys. If there are $x$ boys, the product of the number of boys and the number of girls is 90.
Write this as a quadratic equation in standard form and find the number of boys $x$ .

Step-by-Step Solution

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More Class 10 Standard Form and Roots practice

In a class trip the number of girls is 1 more than the number of boys. If there are x boys, the product of the number of boys and the number of girls is 90.Write this as a quadratic equation in standard form and find the number of boys x.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Standard Form and Roots practice

In a class trip the number of girls is 1 more than the number of boys. If there are $x$ boys, the product of the number of boys and the number of girls is 90.
Write this as a quadratic equation in standard form and find the number of boys $x$ .