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First expand (b-4)(b+5) b²-4b+5b-4*5Simplifyb²+b-20

First substitute (3x) into the equation for f(x), giving f(3x) = 8 - 9x². This is then equal to -28 and so it is remains to solve the equation 8 - 9x² = -28. This can be written as 9...

First multiply the brackets to get: (2x² - 6x + x - 3), Simplify to get: (2x² - 5x - 3), This is then all multiplied by x to get: 2x³- 5x² - 3x.

electrostatic forces between oppositely charged ions.

The dead or inactive form of the pathogen stimulates the adaptive immune system. It forces white blood cells to form antibodies against the pathogen, so that if a future invasion by the same pathogen was ...