Polynomial Plots: Polynomials at a value comic video

0:00 LearnFun Comics. Polynomial Plots. Watch out for those sneaky values!

0:05 Mathville. Momo solves the puzzle.

0:09 Today’s polynomial is easy! Just plug in x = 2.

0:13 2? So simple! 2 is always 2!

0:16 But what if the 2 is in the middle of a 2x? Huh?

0:20 Polynomials at a value

0:22 Put number in for x.. Do math, get number.. Like magic with nums.

0:27 Okay! Today’s polynomial is easy. Just put 2 in for x!

0:32 Like 3x + 2? 3 times 2 plus 2 makes 8!

0:36 Like 2x + 1? 2 times 2, then add 1. It’s 5!

0:41 2 × 2 = 4. 4 + 1 = 5. Easy as 1, 2, 3!

0:47 Momo’s method

0:48 Write down the poly.. Replace x with num.. Do math, check work.

0:53 Write the polynomial, substitute, solve like a puzzle.

0:57 Your turn, hero! For 2x + 3, if x = 3, what’s the value? A: 12. B: 6. C: 8. D: 9

1:11 The answer is 9. 2 × 3 = 6, 6 + 3 = 9.

1:16 Ha! 2x + 1? 2 times 2 plus 1 makes 5! Magic!

1:21 If 5x - 2 = 13, what’s x? A: 1. B: 2. C: 3. D: 5

1:32 The answer is 3. 5 × 3 - 2 = 15 - 2 = 13.

1:38 The final battle In x^2 + 4x + 4 when x = -2, what’s the total? A: 4. B: 8. C: 12. D: 0

1:53 The answer is 0. -2 × -2 = 4, 4 × -2 = -8, 4 + -8 + 4 = 0.

2:02 2x + 1? That’s it? 5 is 5! Duh!

2:06 No tricks! 2x + 1 equals 5 when x equals 2.

2:10 The vault opens, and Momo smiles. Mathville is safe. Again.

2:15 Remember. Write down the polynomial first. Replace x with the number. Do the math in order.

2:21 But wait! x is hiding somewhere. Who will find it first?

2:25 Read this comic and answer the questions yourself, at learn fun dot in.