Substitute a=1,b=−15 and c=−7 into the quadratic formula a=2a−b±b2−4ac
a=215±(−15)2−4(−7)
Simplify the expression
More Steps
Evaluate
(−15)2−4(−7)
Multiply the numbers
More Steps
Evaluate
4(−7)
Multiplying or dividing an odd number of negative terms equals a negative
−4×7
Multiply the numbers
−28
(−15)2−(−28)
Rewrite the expression
152−(−28)
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses