Question

find the value of x in 15x²+45x-4=0​

Answer 1

Answer:

Solution set for x = {1.24, -0.64}

Step-by-step explanation:

Question: 5x² - 3x - 4 = 0

a = 5, b = -3, c = -4

x = -b+-(√b²-4ac) / 2a

x = -(-3)+-(√(-3)² - 4(5)(-4) / 2(5)

x = 3 +-(√9 + 80) / 10

x = 3 +-√89 / 10

x = 3 +- 9.433 / 10

Solution 1 for x = 3 + 9.433 / 10

x = 12.433/10 = 1.2433

Rounded off to two decimal places: 1.24

Solution 2 for x = 3 - 9.433 / 10

x = -6.433/10 = -0.6433

Rounded off to two decimal places: -0.64

Solution set for x = {1.24, -0.64}