Question

X minus 7 ka whole square minus x + 8 ka whole square is equal to 75 the value of x is

Answer 1

${(x - 7)}^{2} - {(x + 8)}^{2} = 75 \\ {x}^{2} + 49 - 14x - {x}^{2} - 64 - 16x = 75 \\ - 30x - 15 = 75 \\ 30x + 15 + 75 = 0 \\ 30x = - 90 \\ x = - 90 \div 30 \\ x = - 3$