book Maths Puzzle Numerical Ability

One end of a ladder is 10 feet from the base of a wall. the other end reaches a window in the wall. the ladder is 2 feet longer than the height of the window. Please help

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If K(x)=x^2(x^2+16), then find K(4-the sq. root of 2) by synthetic substitution hey! i need some serious help!! ok how do i solve this ..

g(-1)-1 when -> g(x)= x^2 - x please help me