Question

The value of P(x) = 5x-4x^2+3 at x=-1 is (hint x^2 means x square)​

Answer 1

QUESTION:

The value of P(x) = 5x - 4x² + 3 at x = - 1 is

ANSWER:

• P(x) at x = - 1 or p( - 1) = -6

GIVEN:

• P(x) = 5x - 4x² + 3 and x = - 1

TO FIND:

• The value of p(x)

EXPLANATION:

Substitute x = - 1 in p(x)

P( -1 ) = 5(- 1) - 4(- 1)² + 3

P( -1 ) = - 5 - 4 + 3

P( -1 ) = - 6

P(x) at x = - 1 or p( - 1) = -6.

SOME MORE POINTS:

LINEAR POLYNOMIAL :

• ax + b = 0

QUADRATIC POLYNOMIAL:

• ax² + bx + c = 0

CUBIC POLYNOMIAL:

• ax³ + bx² + cx + d = 0

FOR QUADRATIC EQUATION:

$\large{\boxed{\sf{x = \dfrac{ - b \pm \sqrt{ {b}^{2} - 4ac } }{2a}}}}$

IDENTITES:

• (x + y)² = x² + 2xy + y²

• (x - y)² = x² - 2xy + y²

• x² - y² = (x + y)(x - y)

• x² + y² = (x + y)² - 2xy

• x³ + y³ + z³ - 3xyz = (x + y + z)(x² + y² + z² - xy - yz - zx)