Which expression is equivalent to 7x^2√2x^4 - 6√2x^12 , if x ≠ 0? A. 26x^22
B. 13x^12
C. 84x^20
D. 42x^22

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Are triangles the congruent? write the congruency statement.what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?