Any changes that you do make will be most effective if introduced gradually. this will mean that you are more likely to stick to them, meaning you can introduce more without feeling under too much pressure. easy changes to make include; swapping white bread for brown bread, full fat milk for half fat milk, cutting out snacks etc. you should also choose a weight loss program that encourages gradual weight loss rather than immediate weight loss. by doing this, the weight you lose is more likely to stay off and, by setting achievable monthly targets rather than unrealistic weekly targets, you are more likely to meet them.
а = 2; b = 2; c = -24
D = b² - 4ac = 2² - 4 * 2 * (-24) = 4 + 192 = 196
а₁ = - b + √D = - 2 + √196 = -2 + 14 = 3
2a 2 * 2 4
а₂ = - b - √D = - 2 - √196 = -2 - 14 = -4
2a 2 * 2 4
2) х (х - 7) = 0
х = 0 или х - 7 = 0
х = 0 или х = 7
3) а(а - 2.3)(а + 9.1) = 0
а = 0 или а - 2,3 = 0 или а + 9,1 = 0
а = 0 или а = 2,3 или а = - 9,1
4) 67² - 57² = (67 - 57)(67 + 57) = 10 * 124 = 1240