Question

1/6x²y² from -2x²y²
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Answer 1

Answer:

x + y)^2 = (x + y)(x + y) = x² + xy + xy + y² = x² + 2xy + y²

(x + y)^3 = (x + y)(x + y)(x +y) = (x + y)(x² + 2xy + y²) = x³ + 2x²y + xy² + x²y + 2xy² + y³ = x³ + 3x²y + 3xy²+ y³

(x + y)^4 = (x + y)(x + y)(x +y)(x + y) = (x + y)(x³ + 3x²y + 3xy²+ y³) = x^4 + 3x³y + 3x²y² + xy³ + x³y + 3x²y² + 3xy³ + y^4 = x^4 + 4x³y + 6x²y² + 4xy³ + y^4

Look at the coefficients:

(x + y)^2 --> 1 2 1

(x + y)^3 --> 1 3 3 1

(x + y)^4 --> 1 4 6 4 1

Answer 2

Answer:

Unicellular organisms include bacteria, protists, and yeast. For example, a paramecium is a slipper-shaped, unicellular organism found in pond water.