exam Maths Puzzle Numerical Ability

Solve the equation by completing the square

x^2 + 4x - 21 = 0

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exam Other Question

Factoring Completely: how would you factor a problem like this one, whats the answer? (5x^2 - 10x) Could someone please help me with this problem?

Graph y=2^x-3. Label all x-intercepts, all y-intercepts, horizontal asymptotes, and vertical asymptotes.

Thank you!!