When solving an equation, Gabrielle's first step is shown below. Which property justifies Gabrielle's first step? Original Equation:
4x + x^2 - 5 = 0

First step:
x^2 + 4x - 5 = 0

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?