Which shortcut could be used to prove the two triangles are congruent?

What is the binomial expansion of (2x-3)^5

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

X+y=-4 x-y=2 use elimination with adding and subtraction