exam Maths Puzzle Numerical Ability

3y^2+5y-8=0 That is supposed to read 3y squared. I must solve the equation(i.e. x=4 0r 6).

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how do i solve -6x(x+1)+4=16 Find a rational zero of the polynomial function and use it to find all the zeros of the function.

f(x) = x to the third power + 2x to the second power - 9x - 18