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70 x 30 = 2,100
The two square roots of 4,900 are +70 and -70 . 70 x 70 = 4,900 (-70) x (-70) = 4,900
x = + or - 9 x/9 = 9/x x squared = 81 x = +/- 9
70 x 8 x 3/4 ie 420