(8x- 7/16)²
64x² -7x +d = ?
(8x)² - 2*8x*√d +(√d)² = (8x)² -2*8x*7/16 +(7/16)² = (8x- 7/16)²
2*8*√d = 7
√d = 7/(2*8)=7/16
(8x- 7/16)²
64x² -7x +d = ?
(8x)² - 2*8x*√d +(√d)² = (8x)² -2*8x*7/16 +(7/16)² = (8x- 7/16)²
2*8*√d = 7
√d = 7/(2*8)=7/16