exam Maths Puzzle Numerical Ability

How do you do the following?
x2-7x+10=0
x2+5x+6=0
x2-3x-4+0
y2+2y-8=0

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exam Other Question

How do you complete the square for (((2x^2+3x+4=0)))? please help.

factor the trinomial

-p^2=12p+27

having trouble when there is a negative number involved