exam Maths Puzzle Numerical Ability

Can you help me double check this using the quad formula?:

x^2 - 10 - 1 = -10

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exam Other Question

Please help solve_______
Prove: If the base angles od a triangle are congruent, then the triangles is isosceles.
Draw and label a diagram that includes:
1.) a triangles with eac P=2L + 2W (for the L)