exam Maths Puzzle Numerical Ability

please help me to find the value of x and y
70 (4x-2y) (4x+2y) 50

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exam Other Question

Line segment CD is the altitude on the hypotenuse of right triangle ABC. AB=25 and AC=20. Find the length of line segment BD, the length of altitude CD, and the degree measure of a Given a quadratic equation y = ax2 + bx + c, what is the effect of changing the value of the number c on the parabola? In other word, if two parabolas have the same coefficients a, and b, but different values for c, how will they differ?