exam Maths Puzzle Numerical Ability

Evaluate the discriminant b^2-4ac. Then use the answer to state how many real-number solutions exist for the equation.
〖y=x〗^2+8x+16

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exam Other Question
solve
X^4-10x^2+9=0
and
y-2-8(sqrt)(y-2)+15=0

Thanks! how do you divide with polynomials?