Work out substitute into formula instantly with clear inputs, formula shown and shareable results.
Substitution replaces the variable with a number and then evaluates, respecting the order of operations: powers first, then multiplication, then addition.
Substitution
value = a·x² + b·x + c evaluated at the given x
2 × 16 − 20 + 3 = 32 − 20 + 3 = 15.
Square first, so x² stays positive. At x = −4 the result is 32 + 20 + 3 = 55.