No 9 & 10 please buat besok

9||

X1 = X2 + 7
X1 - X2 = 7
√D/a = 7
√D = 7
D = 49
b² - 4ac = 49
a² - 4(1)(60) = 49
a² - 240 = 49
a² = 289
a = √289
a = 17

10||

2x² - 3ax + (a + b) = 0

b ? Soal aneh